/// <summary>
/// Adds the items to the generator with the weight specified.
/// </summary>
/// <param name="items">The items to add to the generator.</param>
/// <param name="weight">The weight at which to add the items.</param>
public void Add(IEnumerable <T> items, int weight)
{
if (items == null)
{
throw new ArgumentNullException(nameof(items));
}
var previous = new Queue <T>();
foreach (var item in items)
{
var key = new ChainState <T>(previous);
this.Add(key, item, weight);
previous.Enqueue(item);
if (previous.Count > this.order)
{
previous.Dequeue();
}
}
var terminalKey = new ChainState <T>(previous);
var newWeight = Math.Max(0, this.terminals.ContainsKey(terminalKey)
? weight + this.terminals[terminalKey]
: weight);
if (newWeight == 0)
{
this.terminals.Remove(terminalKey);
}
else
{
this.terminals[terminalKey] = newWeight;
}
}
/// <summary>
/// Gets the weights of termination following from the specified state.
/// </summary>
/// <param name="state">The state preceding the items of interest.</param>
/// <returns>A dictionary of the items and their weight.</returns>
public int GetTerminalWeight(ChainState <T> state)
{
this.terminals.TryGetValue(state, out var weight);
return(weight);
}
/// <summary>
/// Adds the item to the generator, with the specified state preceding it.
/// </summary>
/// <param name="state">The state preceding the item.</param>
/// <param name="next">The item to add.</param>
/// <remarks>
/// See <see cref="MarkovChain{T}.Add(ChainState{T}, T, int)"/> for remarks.
/// </remarks>
public void Add(ChainState <T> state, T next) => this.Add(state, next, 1);